This command is used to invite an client to a channel and to manage
the channel's invite list. Wildcards may be used with this command.
+In invite list it is possible to add nicknames, server name, username,
+hostname or netmask (IP/MASK), and public keys.
+
Examples:
/INVITE silc joe
Invites nickname `joe' to channel 'silc', and adds the client
Adds nicknames foo* from silcnet.org server from *.foobar.com
hosts to the invite list of the current channel.
+ /INVITE * +/path/to/public_key.pub
+ Adds the public key from file /path/to/public_key.pub to
+ invite list of the current channel.
+
/INVITE * -joe
Removes nickname `joe' from the invite list of the current
channel.